"It scares me to death to see what's going on-just seeing this right now," said Mark Rengo, an eyewitness.

Another logging truck lost its load in the same spot in December 2012, tying up traffic for two hours.

Duluth Mayor Don Ness says both incidents underscore the importance of getting logging trucks out of the downtown area.

"Unfortunately because of federal regulations they are not allowed to use our highway system," Mayor Ness said.

The Mayor says the primary concern is Superior Street, especially during the winter with piles of snow creating restrictions.

"Thank goodness the spill happened in an area that didn't have a lot of pedestrians walking around or a lot of parked cars in the area, that could have created tremendous amounts of damage," the Mayor said.

US Congressman Rick Nolan (D-Minnesota) is working with the US Department of Transportation to put large trucks on the Highway.

"I'm working with the US DOT Secretary Anthony Fox on a weight limit exemption to address the problem of these logging trucks along Duluth's Main thoroughfare, Superior Street," Rep. Rick Nolan said.

An answer is expected in the coming days. Until then the city is urging truckers to use alternate routes to minimize potential dangers.